Gyro Compass And Inertial Navigation System MGC R3

0
46
Gyro Compass And Inertial Navigation System MGC R3

A new family of products with motion sensing and gyro compass functionality is introduced. The first product in this family is the MGC R3 which includes three Ring Laser Gyros and three linear accelerometers.

TYPICAL APPLICATIONS

The MGC R3 product is a fully inertial navigation system (INS). It can output heading, roll, pitch, heave and position. Acceleration and velocity of linear motions, as well as angular rates, are output from the unit. The MGC R3 product outputs both processed and raw (gyro and accelerometer) sensor data.

The MGC R3 product can be used as a stand-alone unit or as an IMU in other systems. The product is designed for high precision maritime applications such as offshore operations and seabed mapping.

The product includes integrated navigation algorithms with input from a GNSS receiver for output of aided position and heading data. The proven PFreeHeave® algorithms are part of the navigation algorithms that enable down to 2 cm accuracy in delayed heave output and 5 cm accuracy in real-time heave output. The linear position and velocity measurements can be output in up to four different points on the vessel.

The mounting bracket has been specially designed to enable easy alignment to the vessel axis or the axes of the system on which the unit shall measure the motion. This will ensure that the user gets precise measurements from the unit when it is installed.

Gyro Compass And Inertial Navigation System MGC R3
Gyro Compass And Inertial Navigation System MGC R3

Function

The MGC can operate in Gyrocompass mode and Integrated Navigation mode. In the Gyrocompass mode only, input of speed is required. In this mode the product will output heading, roll, pitch and heave accurately. In the Integrated Navigation mode, input of speed, position and PPS from a GNSS receiver is required (VTG, GGA, ZDA). In this mode the product will output heading, roll, pitch, heave and position.

The unit is delivered with Windows based configuration and data presentation software, the MRC+. In this software vector arms from where the MGC is mounted to the center of gravity (CG) and two individually configurable monitoring points (MPs) can be defined. The heave measurements can be output in four different locations (the MGC itself, CG, MP1 and MP2) simultaneously on serial lines or Ethernet ports. A typical measurement point is the echo sounder transducer head.

Variables output

The MGC outputs heading, roll and pitch and corresponding angular rate vectors. The unit outputs relative (dynamic) heave position, velocity and acceleration. In the Integrated Navigation mode it also outputs position in north and east direction in addition toheight above the ellipsoid.

Digital I/O protocols

MGC data is available through both Ethernet interface and serial lines enabling easy distribution of data to multiple users on board the vessel. Output protocols for commonly used survey equipment are available on two individually configurable serial lines and Ethernet/UDP.

FEATURES

  • 0.01° roll and pitch accuracy.
  • 0.08° secant latitude heading accuracy with GNSS aiding.
  • Outputs on RS-232, RS-422 and Ethernet.
  • High output data rate (200 Hz).
  • Precise heave at long wave periods by use of PFreeHeave ® algorithms.
  • Lever arm compensation to two individually configurable monitoring points.
  • Small size and low power consumption.
  • Each MGC delivered with a Calibration Certificate.
  • Selectable communication protocols in the Windows based MRU configuration software.

TECHNICAL SPECIFICATIONS

MGC R3

ORIENTATION OUTPUT
Angular orientation range±180°
Resolution in all axes0.001°
Accuracy roll, pitch0.01° RMS
Accuracy heading0.08° RMS sec.lat
Accuracy heading (GNSS aided)0.04° RMS sec.lat
Heading settling time to data available<5 min from start-up
Heading settling time to full accuracy (typical)17 min from start-up
GYRO OUTPUT
Angular rate range±149°/s
Angular rate noise0.010°/s RMS
Bias stability (absolute bias)0.008°/h RMS
Angle Random Walk0.008°/ √h RMS
Scale factor error0.001 % RMS
ACCELERATION OUTPUT
Acceleration range (all axes)±30 m/s2
Bias stability (absolute bias)80 µg RMS
Acceleration noise0.0002 m/s2 RMS
Velocity Random Walk3.3 µg/√Hz
Scale factor error0.008% RMS
HEAVE OUTPUT
Output range±50 m, adjustable
Periods (real-time)0 to 25 s
Periods (delayed)0 to 50 s
Heave accuracy (real-time)5 cm or 5% whichever is highest
Heave accuracy (delayed)2 cm or 2% whichever is highest
POSITION OUTPUT
Free inertial5 nm/h
ELECTRICAL
Voltage input24 V DC nominal (18 to 32 V DC)
Power consumptionMax 12 W (typical 11 W)
Serial ports : Com1Bidirectional RS-422
Serial ports : Com2Bidirectional RS-422 from junction box, user configurable RS-232, RS-422
Serial ports : Com3 & Com4Input only, user con figurable RS-232, RS- 422
Analog channels (junction box)# 4, ±10 V, 14 bit resolution
Ethernet output ports5
Ethernet UPD/IP10/100 Mbps
Digital output variables24 (max), Serial or Ethernet
Data output rate (max)200 Hz
Timing< 1 ms
INPUT FORMATS
NMEA 0183, incl. GGA, VBW, VTG, ZDA or MRU Normal format
OUTPUT FORMATS
– MRU normal
– NMEA 0183 proprietary
– Atlas Fansweep
– Seapath binary 23, 25, 26
– KM binary
– RDI ADCP
– NMEA GGA, GLL, HDT, THS, ROT, VTG, GST, VER, HCR
– Sounder
– EM3000
– TSS1
– PFreeHeave®
– MDL Trim Cube
– Tokimec PTVG
OTHER DATA
MTBF (computed)50000 h
MTBF (service history based)100000 h
MaterialAnodised aluminium
Connector (MIL. spec.)Souriau 851-36RG 16-26S50
WEIGHTS AND DIMENSIONS
Weight8.0 kg
Dimensions (HxLxW)188.9 x 189.5 x 189.5 mm
ENVIRONMENTAL SPECIFICATIONS
Operational temperature range-15 to +55°C
Storage temperature range-25 °C to +70 °C
Enclosure protectionIP66
VibrationIEC 60945/EN 60945
ELECTROMAGNETIC COMPATIBILITY
Compliance to EMCD, immunity/emissionIEC 60945/EN 60945

Read more : KONGSBERG, Gyro Compass MGC R2 For Ship / High Speed Crafts; KONGSBERG, Motion Sensor and Gyro Compass; ACOUSTIC CONTROL SYSTEM FOR BOP OPERATION; HIPAP – ACOUSTIC UNDERWATER POSITIONING AND NAVIGATION SYSTEMS; µPAP (MICROPAP) COMPACT ACOUSTIC POSITIONING SYSTEM; TRANSPONDER, FOR EXPLOSIVE ATMOSPHERE

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.